Bilan ecologique du detournement permanent d'un petit fleuve côtier dans l'émissaire d'eaux usées d'une grande ville |
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| Authors: | Gérard Bellan Michel Bourcier |
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| Institution: | Station Marine d''Endoume, rue Batterie des Lions, 13007 Marseille, France |
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| Abstract: | The benthic communities established on soft substrata off the outlet of the main sewer of the city of Marseilles were investigated in June 1980 and January 1981; this was about a year and a half after the permanent diversion of a polluted river into the sewer. Although the quantity of pollutants does not seem to have been appreciably modified within these communities, we note, in comparison with the former state: a decrease in the number of species and individuals of roughly 50 to 25% according to the stations (except for the one nearest the outlet); a perceptible decrease of the diversity and similarity indices; an increase in the dominance of muddy substratum species. All of these observations demonstrate degradation of the communities. |
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